Frequency Polygon

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In a frequency distribution, the mid-value of each class is obtained. Then on the graph paper, the frequency is plotted against the corresponding mid-value. These points are joined by straight lines. These straight lines may be extended in both directions to meet the X - axis to form a polygon.

The weights of 50 students are recorded below. Draw a frequency polygon for this data.

The marks scored by 120 students in an examination are as given in the table form a frequency polygon.

If the above graph is joined by a smooth curve, then it is known as a frequency curve.


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